Conductors should be of an appropriate size for the application, and should pass through openings with no sharp edges with sufficient clearance to prevent fraying or damage. If they are accessible to the user of the product, they must be tested to withstand a certain amount of “strain” (for more on strain relief, see below). Finally you can never cross low voltage and high voltage conductors unless the low voltage wiring is rated for the higher voltage. For example, a wire carrying 12 volts may be in contact with a wire carrying 120 volts so long as it is rated for 120 volts itself.

 

This process has led production people to do small runs of 50 or 100 units, then they call us so they can avoid the whole system of full certification and follow-up service. We come to the site, inspect the units, label them, and then we go away. If you have another small run we can come back and do it again. We’ve already done the testing , so this time all we have to do is verify that the units you want labeled are the same. Once we do we put a sticker on them. That makes this follow-up less costly. Once we’ve labeled the units, we’re gone. In cases like these we are red-tag erasers. If you get red-tagged we can free the piece of machinery so you can get back into production. 

Compliance Tip: Designating the Correct Driver Can Save Time and Money

 

LED Drivers have always been in the Recognized Component program at UL. One problem is being able to use multiple suppliers of Drivers without having temperature testing being repeated. UL was proactive in this regard and has introduced the TL program for Drivers. Get your Luminaire Listed with a TL rated Driver and get alternate Drivers added with no additional temperature testing. Your UL descriptive report still needs to be updated, but getting out of temperature testing speeds up the process. Talk to your suppliers or look in UL’s Category “FKSZ2” to find Drivers with a TL rating. Pick the hottest one your Luminaire can handle and adding lower rated TL Drivers is paperwork.